Basic Single sign on application in ASP.Net

Hi Team I have develoved 10 Asp.net webforms(aspx) Appliactions ,now i want to make appliaction that can call/redirect to other applications  using one time login and selecting each appliactions( employee mngmnt,project mngmnt, Asset mngmnt,product mngmnt etc.;)i want to use these credentials for authenticating in each application, i dont want to use microsoft default owin security or Microsoft.AspNet.Identity i am using custom login program (username, password, usergroup) with session to handle the credentials in each individual application